diff --git a/repository/OpenPonk-Core/ManifestOpenPonkCore.class.st b/repository/OpenPonk-Core/ManifestOpenPonkCore.class.st
index 0a3273a8..1d08589e 100644
--- a/repository/OpenPonk-Core/ManifestOpenPonkCore.class.st
+++ b/repository/OpenPonk-Core/ManifestOpenPonkCore.class.st
@@ -15,3 +15,10 @@ ManifestOpenPonkCore class >> ruleRTInvocationSequenceRuleV1FalsePositive [
 ManifestOpenPonkCore class >> ruleReTestClassNotInPackageWithTestEndingNameV1FalsePositive [
 	^ #(#(#(#RGPackageDefinition #(#'OpenPonk-Core')) #'2020-05-27T10:56:37.652665+02:00') )
 ]
+
+{ #category : 'code-critics' }
+ManifestOpenPonkCore class >> ruleStringConcatenationRuleV1FalsePositive [
+
+	<ignoreForCoverage>
+	^ #(#(#(#RGMethodDefinition #(#OPMementoDirectorySerializer #loadModelFrom: #false)) #'2024-10-17T12:14:35.401+02:00') )
+]
diff --git a/repository/OpenPonk-Core/OPMementoDirectorySerializer.class.st b/repository/OpenPonk-Core/OPMementoDirectorySerializer.class.st
index 97fe2b80..d0c4d81e 100644
--- a/repository/OpenPonk-Core/OPMementoDirectorySerializer.class.st
+++ b/repository/OpenPonk-Core/OPMementoDirectorySerializer.class.st
@@ -45,9 +45,11 @@ OPMementoDirectorySerializer >> loadDiagramsOf: aModel from: aFolder [
 		                ifFound: [ :exportInfoFile |
 		                OPSerializer forExportInfoFile: exportInfoFile ]
 		                ifNone: [ OPJsonDiagramSerializer new ].
-	^ ((aFolder filesMatching: '*.' , materializer fileExtension)
-		   reject: [ :any | any basename = OPExportInfo fileName ])
-		  collect: [ :eachFile |
+	^ aFolder files
+		  select: [ :any |
+			  (materializer fileExtensions includes: any extension) and: [
+				  any basename ~= OPExportInfo fileName ] ]
+		  thenCollect: [ :eachFile |
 			  self loadDiagramOf: aModel from: eachFile by: materializer ]
 ]
 
@@ -75,8 +77,16 @@ OPMementoDirectorySerializer >> loadModelFrom: aFolder [
 			                plugin modelSerializerClass forExportInfoFile:
 				                exportInfoFile ]
 		                ifNone: [ plugin modelSerializerClass new ].
-	modelFile := aFolder / 'model' , materializer fileExtension.
-	modelFile exists ifFalse: [ ^ nil ].
+
+	modelFile := aFolder files
+		             detect: [ :anyFile |
+			             materializer fileExtensions anySatisfy: [
+				             :anyExtension |
+				             anyFile basename = ('model.' , anyExtension) ] ]
+		             ifNone: [
+			             self error:
+				             'Failed to find model file in .opp'
+				             , aFolder absolutePath pathString ].
 	^ modelFile readStreamDo: [ :stream |
 		  materializer materializeModelFrom: stream ]
 ]
diff --git a/repository/OpenPonk-Core/OPSerializer.class.st b/repository/OpenPonk-Core/OPSerializer.class.st
index 908a751b..c4e9bdb8 100644
--- a/repository/OpenPonk-Core/OPSerializer.class.st
+++ b/repository/OpenPonk-Core/OPSerializer.class.st
@@ -30,7 +30,13 @@ OPSerializer class >> exportVersion [
 { #category : 'accessing' }
 OPSerializer class >> fileExtension [
 
-	^ self formatName
+	^ self fileExtensions first
+]
+
+{ #category : 'accessing' }
+OPSerializer class >> fileExtensions [
+
+	^ { self formatName }
 ]
 
 { #category : 'as yet unclassified' }
@@ -102,6 +108,11 @@ OPSerializer >> fileExtension [
 	^ self class fileExtension
 ]
 
+{ #category : 'accessing' }
+OPSerializer >> fileExtensions [
+	^ self class fileExtensions
+]
+
 { #category : 'formatting' }
 OPSerializer >> formatName [
 	^ self class formatName
diff --git a/repository/OpenPonk-Spec/ManifestOpenPonkSpec.class.st b/repository/OpenPonk-Spec/ManifestOpenPonkSpec.class.st
index dfe33778..3cda8055 100644
--- a/repository/OpenPonk-Spec/ManifestOpenPonkSpec.class.st
+++ b/repository/OpenPonk-Spec/ManifestOpenPonkSpec.class.st
@@ -13,3 +13,17 @@ Class {
 ManifestOpenPonkSpec class >> ruleRBContainsRuleV1FalsePositive [
 	^ #(#(#(#RGMethodDefinition #(#OPModelTypeSelector #addModel #false)) #'2021-03-04T21:09:27.51689+01:00') )
 ]
+
+{ #category : 'code-critics' }
+ManifestOpenPonkSpec class >> ruleRefersToClassRuleV1FalsePositive [
+
+	<ignoreForCoverage>
+	^ #(#(#(#RGMethodDefinition #(#'OPLegacyProjectLoadTest class' #generateFromProjectFile: #true)) #'2024-10-17T11:08:54.945+02:00') )
+]
+
+{ #category : 'code-critics' }
+ManifestOpenPonkSpec class >> ruleTempsReadBeforeWrittenRuleV1FalsePositive [
+
+	<ignoreForCoverage>
+	^ #(#(#(#RGMethodDefinition #(#'OPLegacyProjectLoadTest class' #generateFromProjectFile: #true)) #'2024-10-17T11:08:51.1+02:00') )
+]
diff --git a/repository/OpenPonk-Spec/OPLegacyProjectLoadTest.class.st b/repository/OpenPonk-Spec/OPLegacyProjectLoadTest.class.st
new file mode 100644
index 00000000..a3c9b31a
--- /dev/null
+++ b/repository/OpenPonk-Spec/OPLegacyProjectLoadTest.class.st
@@ -0,0 +1,96 @@
+Class {
+	#name : 'OPLegacyProjectLoadTest',
+	#superclass : 'TestCase',
+	#instVars : [
+		'workbench'
+	],
+	#category : 'OpenPonk-Spec-Tests',
+	#package : 'OpenPonk-Spec',
+	#tag : 'Tests'
+}
+
+{ #category : 'generating' }
+OPLegacyProjectLoadTest class >> generateFromDesktopProjects [
+
+	<script>
+	FileLocator desktop asFileReference files
+		select: [ :each | each extension = 'opp' ]
+		thenDo: [ :file | self generateFromProjectFile: file ]
+]
+
+{ #category : 'generating' }
+OPLegacyProjectLoadTest class >> generateFromProjectFile: file [
+
+	| pluginName version modelName base64 className |
+	pluginName := (file basename copyUpToLast: $-) capitalized.
+	version := (file basename copyAfterLast: $-) reject: [ :each |
+		           each = $. ].
+	modelName := pluginName , version.
+
+	file binaryReadStreamDo: [ :s | base64 := s upToEnd base64Encoded ].
+	base64 ifNil: [ self error ].
+
+	className := ('OP' , modelName , 'ProjectLoadTest') asSymbol.
+
+	(OPLegacyProjectLoadTest << className)
+		tag: 'Tests';
+		package: 'OpenPonk-Spec';
+		install.
+
+	(Smalltalk at: className) compile: 'base64ProjectZip
+
+^''' , base64 , '''
+'
+]
+
+{ #category : 'testing' }
+OPLegacyProjectLoadTest class >> isAbstract [
+
+	^ self = OPLegacyProjectLoadTest
+]
+
+{ #category : 'files' }
+OPLegacyProjectLoadTest >> base64ProjectZip [
+
+	^ self subclassResponsibility
+]
+
+{ #category : 'files' }
+OPLegacyProjectLoadTest >> file [
+
+	^ FileSystem memory root / 'testLegacyProject.opp'
+]
+
+{ #category : 'files' }
+OPLegacyProjectLoadTest >> projectZip [
+
+	| file |
+	file := self file.
+	file ensureDelete.
+	file binaryWriteStreamDo: [ :s |
+		s nextPutAll: self base64ProjectZip base64Decoded ].
+	file exists ifFalse: [
+		self error: 'Failed to save the base64 as file in memory' ].
+	file size isZero ifTrue: [
+		self error: 'File with base64 content is empty' ].
+	^ file
+]
+
+{ #category : 'running' }
+OPLegacyProjectLoadTest >> tearDown [
+
+	self file ensureDelete.
+	workbench ifNotNil: [ workbench delete ].
+	super tearDown
+]
+
+{ #category : 'tests' }
+OPLegacyProjectLoadTest >> testLoad [
+
+	| project |
+	project := OPProjectController fromFile: self projectZip.
+	workbench := project open.
+	self assert: workbench focusedEditor isNotNil.
+	self assert:
+		workbench focusedEditor canvasPresenter canvas shapes isNotEmpty
+]